Layson



(No Model.)

A. W. FINLAYSON. STEAM GENERATOR. No. 519,059. Patented May 1, 18911..l

' UNirEn STATES ALEXANDER W. FINLAYSON, OF DETROIT, MICHIGAN, ASSIGNOR, BY MESNE` PATENT OFFICE.

ASSIGNMENTS, OF TWOTTHIRDS TO THE FINLAYSON BOILER COMPANY,

LIMITED, OF SAME PLACE.

STEAM-GENERATOR.

SPECIFICATION forming peet ef Letters Patent Ne. 519,059, dated Mey 1, 1894. Appneetiet siednovemter 14,1893. senti 110,490,919. (Nemen To all whom it may concern:

Be it known that I, ALEXANDER W. FIN- nAYsON, a citizen of the UnitedStates, residlng at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Steam Generators, of which the following is a specification, reference being had therein to the accompanying drawings. t

o The invention consists in the peculiar construction of the circulating means for the water, whereby an economical and efficient generation of steam is accomplished with a minimum expense of coal.

5 The invention further consistsin the peculiar construction, arrangement and combination of the various parts, all as more fully hereinafter described.

In the drawings, Figure 1 is a vertical, cen- :o tral, longitudinal section of my improved steam generator. Fig. 2 Yis a cross section thereof on line Fig. 3 is a side eleva# tion with the casing removed. Fig. et is asection of one of the specialittings employed in :5 my device.

A and B are two vertical waterlegs forming the front and back respectively of the generator. These water legs are connected together near the top centrally by the steam ,o drum C and near the bottom at each side by theconnecting tubes Dthe whole forming a substantially rigid structure, adapted to .be incased within a suitable casingE and adaptedto support suitable circulating pipes for ;5 circulating the water which is fed into the tubes D, crossing the combustion chamber of the furnace and delivering it to the steam dome.

F are the grates, which extend between the to, tubes D and are supported thereon, or on the water legs at the ends.

To accomplish the circulation of water from the lower tubes tothe steam dome and carry the water across the entire grate surface and t 5 yet circulate it as nearly vertical as possible, I employ the following construction: G is a series of risers tapped into the tops of the tubes D at their lower ends, and at their upper ends connected to the outer one of a se- ;o ries of loops H, entering at the bottom of the loop. These loops each consist ofl a special return bend I having lateral passagesJ at each side and the usual fitting apertures for the connecting pipes. These loops are connected together at top and bottom by means of the nipples K engaging into the apertures J, as plainly shown in Fig. 4. There are a suliicient number of these loops to extend from the pipe G inwardly to near the middle of the combustion chamber, there being a like series of groups on each side and the two series connect together to a common loop L in the middle of the combustion chamber and connect into the bottom of the steam dome C by means of the single nipple M. The tops of the loops are connected together as described, and the innerloops are connect-- ed to the steam dome by means of the nipples N on each side of the center. There area sufficient number of these series of loops to extend from the front Water leg to the rear water leg entirely over the grate surface, or as many as maybe desired, the lower ends of the loops being sufficiently above the top of the grate to allow of firing through the door O and for proper combustion. The circulation of Vwater through each one of these series of loops is as follows: The water will rise through the riser G and be distributed laterally through the connecting nipples K at the bottoms of the loops partly rising through each of the loops H and passing through the upper connecting nipples K and through the nipple N into the steam dome, while a part will pass entirely through the horizontal passage way and into the central loop Lthrough the nipple M into the bottom of the dome. I thus obtain a very much larger area of circulation through which water from the single riser G must pass in order to enter the steam dome, so that the circulation through each one of the loops and the horizontal nipples will be comparatively slow, while the total result in circulation will be extremely rapid, at the same time heating the water to a very high temperature before entering the steam dome, the steam dome itself being subjected on all sides to the heat ofthe furnace. The products of combustion'pass olf through thechimney P. The water is fed Ioo into the rear ends of the tubes D and I preferably arrange coils Q on each side of the steam dome above the loops H through which the feed water passes. These coils at the rear enter the water leg B and pass down therethrough in a pipe Q entering the rear end of the tubes D, as shown in Figs. 1 and 3.

R is a perforated dry pipe extending horizontally through the top of the steam dome and having apertures only on its upper side, beingprovided at each end with the upturned extensions R and cross-heads R2 in the upper ends of the water legs, so that steam will be taken from all parts of the steam dome through the steam discharge pipe S, which extends centrally out of the steam dome. Above the dome this pipe is branched into the branches S' S2 extending to the sides of the casing and rearwardly, thence downwardly to the lower end of the superheating coils T at each side, which are of a similar construction to the loops or coils I-I and extending longitudinally ot the combustion chamber outside of said coils H. These coils or loops at their forward ends are provided with the outlet pipes U which extend over the steam dome and are united in a similar steam supply V which passes ont through the casing. Thus it will be seen that this arrangement not only gives me a most excellent circulation of the waterto obtain the best results in economy and steam generation, but also provides ample space for steam superheatlng coils and feed water heater.

Vhat I claim as my inventionA isl. In a steam generator, the combination with a casing, of water legs at opposite ends thereof, a centrally arranged steam d rum connecting the tops, and side tubes connecting the bottoms of the legs, a grate, a series of vertically disposed circulating loops above the grate connecting with the side tubes and having connections at top and bottom with the drum, substantially as described.

2. In the steam generator, the combination of two end water legs, connections between the two consisting of a steam dome centrally at the top, and by tubes at each side at the bottom, connections from the side tubes to the steam dome consisting of a series of loops connected together at top and bottom, and to the dome and tubes, substantially as described. Y

3. In a steam generator, the combination with end water legs, a steam drum and side tubes connecting the legs, a series of heating loops, a pipe connection between the loops and tubes, pipe connections between the tops and bottoms of adjacent loops and pipe connections between the top and bottom of the end loops of the series and the steam drum, substantially as described.

4. In a steam generator, the combination with the water legs at each end, a steam dome connecting the legs centrally at the top and the water tubes connecting the legs at each side at the bottom, the circulating pipes connecting the side tubes with a steam dome and snperheating coils arranged outside of said circulating pipes and within the casing,

and connectionsat opposite ends of said coils with the steam dome and the steam supply pipe respectively, substantially as described. 5. In a steam' generator, the combination with the end water legs, the steam dome connecting said legs centrally at the top, and water tubes connecting said legs at the bottom, the circulating pipes connecting said tubes with the steam dome, and the feed water coils Q arranged on each side of the steam dome, and above the connecting pipes, and connected at one end to the rear ends of the connecting tubes and at the other end to the water supply pipe, substantially as described. In testimony whereof I affix my signature in presence of two witnesses. i

ALEXANDER W. FINLAYSON. Witnesses:

M. B. ODOGHERTY, O'rro F. BARTHEL. 

